Answers

Subtract 20/90 from 50/42

1^st number: 1 8/42, 2^nd number: 20/90

50/42 - 20/90 is 61/63.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 90 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 42 × 15 = 630,
   50/42 = 50 × 15/42 × 15 = 750/630
3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
   20/90 = 20 × 7/90 × 7 = 140/630
4. Subtract the two like fractions:
   750/630 - 140/630 = 750 - 140/630 = 610/630
5. After reducing the fraction, the answer is 61/63

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad

Related: ⁵⁰/₄₂-⁴⁰/₉₀ ⁵⁰/₈₄-²⁰/₉₀ ⁵⁰/₄₂-⁶⁰/₉₀

Subtract Fractions Calculator